The issue began when I killed the homeowner but was unable to speak with Bron. I attempted a work around which ended up killing Bron. Now neither NPC is alive and the quest is unfinished. I've spent hours fast traveling, wandering around, and existing the animus. Nothing works. I just want the mystery to reset so I can at least attempt it again. This is the last thing I need to complete to get the platinum trophy.
Please fix ASAP. I've been sitting on this issue for over a month now and see the issue isn't even on the list of known issues despite all the forums about it on this discussion board.